An Asian plant (Brassica rapa subsp. rosularis) of the mustard family, having dark green, spoon-shaped, edible leaves that grow in a dense rosette. Also called spoon mustard.
Origin of tatsoiUltimately from a Chinese source such as Cantonese taap3 coi3 (akin to Mandarin tacài) : Cantonese taap3, to fall down, in reference to its low, spreading rosette of leaves (from Middle Chinese thap) + coi3, vegetable; see bok choy.
Brassica rapa subsp. rosularis